US9683651B2 - Lubrication system for transmission - Google Patents

Lubrication system for transmission Download PDF

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Publication number
US9683651B2
US9683651B2 US14/730,237 US201514730237A US9683651B2 US 9683651 B2 US9683651 B2 US 9683651B2 US 201514730237 A US201514730237 A US 201514730237A US 9683651 B2 US9683651 B2 US 9683651B2
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tubular portion
flange
lubricating oil
enlarged
gear shaft
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US14/730,237
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US20150362060A1 (en
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Shin Fukasawa
Mitsuo Kimura
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Assigned to HONDA MOTOR CO., LTD. reassignment HONDA MOTOR CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FUKASAWA, Shin, KIMURA, MITSUO
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0463—Grease lubrication; Drop-feed lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/042—Guidance of lubricant
    • F16H57/043—Guidance of lubricant within rotary parts, e.g. axial channels or radial openings in shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/031—Gearboxes; Mounting gearing therein characterised by covers or lids for gearboxes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/042—Guidance of lubricant
    • F16H57/0421—Guidance of lubricant on or within the casing, e.g. shields or baffles for collecting lubricant, tubes, pipes, grooves, channels or the like
    • F16H57/0424—Lubricant guiding means in the wall of or integrated with the casing, e.g. grooves, channels, holes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/042—Guidance of lubricant
    • F16H57/043—Guidance of lubricant within rotary parts, e.g. axial channels or radial openings in shafts
    • F16H57/0431—Means for guiding lubricant directly onto a tooth surface or to foot areas of a gear, e.g. by holes or grooves in a tooth flank
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0457—Splash lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0467—Elements of gearings to be lubricated, cooled or heated
    • F16H57/0469—Bearings or seals
    • F16H57/0471—Bearing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/048—Type of gearings to be lubricated, cooled or heated
    • F16H57/0493—Gearings with spur or bevel gears
    • F16H57/0494—Gearings with spur or bevel gears with variable gear ratio or for reversing rotary motion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H2057/02039—Gearboxes for particular applications
    • F16H2057/02043—Gearboxes for particular applications for vehicle transmissions
    • F16H2057/02047—Automatic transmissions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H2200/00—Transmissions for multiple ratios
    • F16H2200/003—Transmissions for multiple ratios characterised by the number of forward speeds
    • F16H2200/0065—Transmissions for multiple ratios characterised by the number of forward speeds the gear ratios comprising nine forward speeds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
    • F16H3/006—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion power being selectively transmitted by either one of the parallel flow paths
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
    • F16H3/02—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion
    • F16H3/08—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts
    • F16H3/087—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts characterised by the disposition of the gears
    • F16H3/093—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts characterised by the disposition of the gears with two or more countershafts

Definitions

  • the present disclosure relates to a lubrication system for a transmission.
  • a manual transmission lubrication system known in the art is configured in such a manner that rotation of a gear shaft causes toothed rotatable members, such as gears, arranged on the shaft to splash lubricating oil stored in a bottom portion of a housing, drops of the splashed lubricating oil collide with one another and scatter in all directions, the gear shaft or a bearing for the shaft is sprayed with the drops of the lubricating oil, and rotational sliding portions of members are lubricated with the sprayed lubricating oil.
  • Another transmission lubrication system known in the art is configured as follows (refer to Japanese Unexamined Patent Application Publication No. 2002-310271, for example).
  • a gear shaft has therein a lubricating oil supply hole extending axially and having one open end.
  • a plurality of supply ports arranged in a circumferential surface of the gear shaft communicate with the lubricating oil supply hole.
  • a hollow plug member (or pipe member) is disposed between the lubricating oil supply hole and a transmission case such that the plug member enters the lubricating oil supply hole.
  • Part of lubricating oil splashed by gears passes through a lubricating oil passage in the transmission case and is supplied through the pipe member into the lubricating oil supply hole in the gear shaft.
  • the supplied lubricating oil passes through the supply ports due to centrifugal force caused by rotation of the gear shaft, so that the lubricating oil is supplied to the gear shaft and toothed rotatable members or rotational sliding portions of a bearing.
  • a lubrication system for a transmission includes a first tubular portion, a second tubular portion, and a hollow cylindrical member.
  • the transmission includes a gear shaft having therein a lubricating oil supply passage that extends axially and has at least one open end, a housing rotatably supporting the gear shaft, and a cover fastened to the housing by a fastener.
  • the cover has therein a lubricating oil passage.
  • the first tubular portion faces an opening of the gear shaft, protrudes from an outer surface of the housing, and has a cavity.
  • the second tubular portion is joined to the first tubular portion.
  • the second tubular portion protrudes from an inner surface of the cover and has a cavity.
  • the hollow cylindrical member is disposed in the first and second tubular portions.
  • the first tubular portion has a first enlarged-diameter part axially extending from a joint at which the first tubular portion is joined to the second tubular portion.
  • the second tubular portion has a second enlarged-diameter part that axially extends from the joint and has a diameter identical to that of the first enlarged-diameter part.
  • the first tubular portion includes a flange at one end adjacent to the gear shaft.
  • the hollow cylindrical member is tightly fitted in the first and second enlarged-diameter parts of the first and second tubular portions joined to each other. The flange and the opening of the gear shaft define spacing therebetween.
  • a lubrication system for a transmission includes a first tubular portion, a second tubular portion, and a hollow cylindrical member.
  • the first tubular portion has a cavity and includes a flange at one end adjacent to a gear shaft of the transmission.
  • the gear shaft has an opening and extends in an axial direction of the gear shaft.
  • the first tubular portion faces the opening of the gear shaft and protrudes in the axial direction from an outer surface of a housing of the transmission.
  • the housing rotatably supports the gear shaft.
  • the flange and the opening define a space between the flange and the opening.
  • the second tubular portion has a cavity, is joined to the first tubular portion, and protrudes in the axial direction from an inner surface of a cover of the transmission.
  • the cover is fastened to the housing with a fastener.
  • the first tubular portion has a first enlarged-diameter part extending in the axial direction from a joint at which the first tubular portion is joined to the second tubular portion.
  • the second tubular portion has a second enlarged-diameter part that extends in the axial direction from the joint and has a diameter substantially equal to a diameter of the first enlarged-diameter part.
  • the hollow cylindrical member is disposed in the first and second tubular portions and tightly fitted in the first and second enlarged-diameter parts of the first and second tubular portions joined to each other.
  • FIG. 1 is a longitudinal sectional view of part of a transmission in an embodiment and illustrates gear shafts and bearings of the transmission.
  • FIG. 2 is an enlarged view of a lubrication system according to the embodiment for the transmission illustrated in FIG. 1 .
  • FIG. 3 is a system configuration diagram of the transmission in the embodiment.
  • FIG. 4 is a diagram explaining a first tubular portion in the embodiment.
  • FIGS. 5A and 5B are diagrams explaining a transmission lubrication system known in the art.
  • FIGS. 1 to 3 illustrate a transmission lubrication system 100 according to this embodiment.
  • FIG. 1 is a longitudinal sectional view illustrating gear shafts and bearings of a transmission in the embodiment.
  • FIG. 2 is an enlarged view of the transmission lubrication system 100 according to the embodiment for the transmission of FIG. 1 .
  • FIG. 3 is a system configuration diagram of the transmission in the embodiment.
  • a counter shaft C/Sh is located above a secondary shaft S/Sh in FIGS. 1 and 3 . Note that the secondary shaft S/Sh is actually located above the counter shaft C/Sh.
  • a target portion of the transmission to be lubricated by the transmission lubrication system 100 includes the secondary shaft S/Sh and bearings BG 1 and BG 2 for the secondary shaft S/Sh.
  • the secondary shaft S/Sh is remote from the level of lubricating oil stored in a bottom portion of a housing 1 at a long distance d 1 .
  • an opening at one end of the secondary shaft S/Sh is remote from a cover 2 at a long distance d 2 .
  • the transmission in the embodiment is, for example, a nine-speed transmission having nine forward gear ratios and a single reverse gear ratio as illustrated in FIG. 3 . This transmission will now be described in brief with reference to FIG. 3 .
  • the transmission includes five major gear shafts, i.e., a main shaft M/Sh, the counter shaft C/Sh, the secondary shaft S/Sh, an output shaft O/Sh, and an idle shaft I/Sh.
  • odd-numbered speed gears namely, a main first-speed gear M 1 G, a main third-speed gear M 3 G, a main fifth-speed gear M 5 G, a main seventh-speed gear M 7 G, and a main ninth-speed gear M 9 G are arranged on the main shaft M/Sh such that the gears except the main first-speed gear M 1 G are rotatable relative to one another.
  • even-numbered speed gears namely, a secondary second-speed gear S 2 G, a secondary fourth-speed gear S 4 G, a secondary sixth-speed gear S 6 G, and a secondary eighth-speed gear S 8 G, and a secondary driven gear SDnG are arranged on the secondary shaft S/Sh such that the gears except the secondary driven gear SDnG are rotatable relative to one another.
  • the main shaft M/Sh is provided with a third-fifth speed synchromesh mechanism 3 / 5 SCR and a seventh-ninth speed synchromesh mechanism 7 / 9 SCR and the secondary shaft S/Sh is provided with a second-fourth speed synchromesh mechanism 2 / 4 SCR and a sixth-eighth speed synchromesh mechanism 6 / 8 SCR.
  • the third-fifth speed synchromesh mechanism 3 / 5 SCR selectively connects either the main third-speed gear M 3 G or the main fifth-speed gear M 5 G to the main shaft M/Sh to rotate the gear synchronously with the shaft.
  • the seventh-ninth speed synchromesh mechanism 7 / 9 SCR selectively connects either the main seventh-speed gear M 7 G or the main ninth-speed gear M 9 G to the main shaft M/Sh to rotate the gear synchronously with the shaft.
  • the second-fourth speed synchromesh mechanism 2 / 4 SCR selectively connects either the secondary second-speed gear S 2 G or the secondary fourth-speed gear S 4 G to the secondary shaft S/Sh to rotate the gear synchronously with the shaft.
  • the sixth-eighth speed synchromesh mechanism 6 / 8 SCR selectively connects either the secondary sixth-speed gear S 6 G or the secondary eighth-speed gear S 8 G to the secondary shaft S/Sh to rotate the gear synchronously with the shaft.
  • Rotational power from a drive power source including an engine ENG and a motor MOT
  • a main clutch MCL is also transmitted to the secondary shaft S/Sh via a secondary clutch SCL.
  • the main clutch MCL is engaged to directly connect the drive power source (the engine ENG and the motor MOT) to the main shaft M/Sh, thus sequentially transmitting torque (rotational driving force) to the main first-speed gear M 1 G, a counter first-speed gear C 1 G, a counter third-speed gear C 3 G, a final driven gear FnG, and a differential gear Diff in that order.
  • the drive power source the engine ENG and the motor MOT
  • the main shaft M/Sh thus sequentially transmitting torque (rotational driving force) to the main first-speed gear M 1 G, a counter first-speed gear C 1 G, a counter third-speed gear C 3 G, a final driven gear FnG, and a differential gear Diff in that order.
  • the secondary clutch SCL is engaged to directly connect the drive power source (the engine ENG and the motor MOT) to a main hollow shaft Mh/Sh disposed on and rotatable relative to the main shaft M/Sh, thus sequentially transmitting torque (rotational driving force) to a drive gear DrG, a reverse driven gear RDrG, the secondary driven gear SDnG, the second-fourth speed synchromesh mechanism 2 / 4 SCR, the secondary second-speed gear S 2 G, a counter second-speed gear C 2 G, the counter third-speed gear C 3 G, the final driven gear FnG, and the differential gear Diff in that order.
  • Third-speed and other speeds are similarly provided.
  • the transmission lubrication system 100 includes a first tubular portion 3 that protrudes from an outer surface of the housing 1 accommodating the shafts, such as the secondary shaft S/Sh, and that has a manifold 3 a through which lubricating oil flows, a second tubular portion 4 that protrudes from an inner surface of the cover 2 having a lubricating oil passage 2 a therein and that is aligned with and joined to the first tubular portion 3 and has a manifold 4 a through which the lubricating oil flows, a flange 5 disposed at one end of the first tubular portion 3 adjacent to the secondary shaft S/Sh, and a dowel member (hollow cylindrical member) 6 tightly fitted in enlarged-diameter parts 3 b and 4 b , which will be described later, to provide a desired pressure of the lubricating oil.
  • a dowel member (hollow cylindrical member) 6 tightly fitted in enlarged-diameter parts 3 b and 4 b , which will be described later, to provide
  • the housing 1 stores a constant amount of lubricating oil and accommodates the secondary shaft S/Sh and the other gear shafts, i.e., the main shaft M/Sh, the counter shaft C/Sh, the output shaft O/Sh, and the idle shaft I/Sh.
  • a positioning dowel hole defined by raised part of the outer surface of the housing 1 is aligned with the secondary shaft S/Sh and is used as an introduction pipe for introducing the lubricating oil into the secondary shaft S/Sh.
  • the dowel hole of the housing 1 includes the manifold 3 a , the enlarged-diameter part 3 b , and an orifice passage 3 c which will be described later, and is configured so that the lubricating oil can reach a lubricating oil supply passage 8 of the secondary shaft S/Sh in a low speed mode.
  • the cover 2 defines a tightly sealed space in the housing 1 and has the lubricating oil passage 2 a for introducing the lubricating oil splashed by toothed rotatable members, such as gears, into the shaft, such as the secondary shaft S/Sh, (or the lubricating oil supply passage 8 ).
  • a positioning dowel hole defined by raised part of the inner surface of the cover 2 is used as an introduction pipe for introducing the lubricating oil into the secondary shaft S/Sh in addition to the positioning dowel hole of the housing 1 .
  • the dowel hole of the cover 2 is accordingly aligned with the dowel hole of the housing 1 and includes the manifold 4 a and the enlarged-diameter part 4 b .
  • the cover 2 is fastened to the housing 1 by bolts 7 .
  • the first tubular portion 3 protruding from the outer surface of the housing 1 serves as the positioning dowel hole.
  • a cavity, serving as the dowel hole is used as the manifold 3 a through which the lubricating oil is supplied to the lubricating oil supply passage 8 of the secondary shaft S/Sh.
  • the orifice passage 3 c which is narrow, is disposed downstream of the manifold 3 a so that the lubricating oil ejected from an end surface of the first tubular portion 3 can reach the lubricating oil supply passage 8 of the secondary shaft S/Sh in the low speed mode.
  • the lubricating oil passes through the orifice passage 3 c , the lubricating oil is squeezed, resulting in an increase in velocity head.
  • the lubricating oil is forcefully ejected from a downstream end of the manifold 3 a such that the lubricating oil appropriately reaches the lubricating oil supply passage 8 of the secondary shaft S/Sh.
  • the first tubular portion 3 has the enlarged-diameter part (hereinafter, “first enlarged-diameter part”) 3 b axially extending in a predetermined range L 3 from a joint 10 at which the first tubular portion 3 is joined to the second tubular portion 4 .
  • the first enlarged-diameter part 3 b has an inside diameter R larger than another inside diameter r 3 of the first tubular portion 3 .
  • the dowel member 6 which is a hollow cylinder, is fitted in the first enlarged-diameter part 3 b and the enlarged-diameter part 4 b (hereinafter, referred to as the “second enlarged-diameter part 4 b ”), which will be described later, of the second tubular portion 4 .
  • the dowel member 6 appropriately prevents the lubricating oil from leaking from the joint 10 of the first and second tubular portions 3 and 4 to cause a reduction in oil pressure.
  • the dowel member 6 functions as a seal for preventing the leakage of the lubricating oil from the joint 10 .
  • the second tubular portion 4 protruding from the inner surface of the cover 2 is aligned with the first tubular portion 3 .
  • the second tubular portion 4 serves as the positioning dowel hole and has the second enlarged-diameter part 4 b for receiving the dowel member 6 .
  • the second enlarged-diameter part 4 b axially extends in a predetermined range L 4 from the joint 10 at which the second tubular portion 4 is joined to the first tubular portion 3 .
  • the second enlarged-diameter part 4 b has an inside diameter R larger than another inside diameter r 4 of the second tubular portion 4 .
  • the flange 5 is disposed at the end of the first tubular portion 3 facing an opening 9 of the secondary shaft S/Sh.
  • the flange 5 is disposed adjacent to an outer circumferential surface of the gear (e.g., the counter first-speed gear C 1 G) closest to the flange 5 .
  • the flange 5 has an inclined side surface (tapered face) 5 a .
  • the flange 5 and the opening 9 of the secondary shaft S/Sh define spacing SP (space SP) therebetween. Consequently, part of the lubricating oil splashed and scattered by, for example, the counter first-speed gear C 1 G, is collected by the side surface 5 a .
  • the collected lubricating oil is guided by a bottom surface 5 b of the flange 5 through the spacing SP to the lubricating oil supply passage 8 and the bearing BG 1 .
  • lubrication of the bearing BG 1 it is difficult to form a through-hole in the vicinity of a stepped portion of the shaft and it would be accordingly difficult to supply the lubricating oil from the inside of the shaft via a through-hole to a side surface of the bearing BG 1 in a lubrication system known in the art.
  • the side surface 5 a of the flange 5 and the spacing SP allow supply of the lubricating oil to the side surface of the bearing BG 1 .
  • the lubricating oil flowing through the lubricating oil passage 2 a in the cover 2 is supplied through the above-described first and second tubular portions 3 and 4 to the lubricating oil supply passage 8 of the secondary shaft S/Sh.
  • Part of the lubricating oil splashed and scattered by the gear closest to the flange 5 for example, the counter first-speed gear C 1 G, is appropriately collected by the side surface 5 a of the flange 5 at the end of the first tubular portion 3 and is then supplied along the bottom surface 5 b of the flange 5 through the spacing SP to the side surface of the bearing BG 1 .
  • the transmission lubrication system 100 requires no additional pipe member for introducing the lubricating oil into the gear shaft whose opening at its end is remote from a lubricating oil ejection port and accordingly requires no attachment of such a pipe member to a transmission case, and enables appropriate lubrication of the inside of the gear shaft and the bearing during transition from the low speed mode to a high speed mode.
  • the dowel holes of the housing 1 and the cover 2 are aligned with the secondary shaft S/Sh.
  • the cavities, serving as the dowel holes, are used as the manifolds 3 a and 4 a for the lubricating oil.
  • the first and second tubular portions 3 and 4 have the first and second enlarged-diameter parts 3 b and 4 b , respectively, such that the enlarged-diameter parts 3 b and 4 b extend in the predetermined ranges L 3 and L 4 , respectively, in opposite directions from the joint 10 of the portions 3 and 4 .
  • the dowel member 6 is tightly fitted in the first and second enlarged-diameter parts 3 b and 4 b .
  • the dynamic pressure of the lubricating oil is increased and the lubricating oil is forcefully discharged (ejected) from the end of the first tubular portion 3 , so that the lubricating oil is supplied to the lubricating oil supply passage 8 of the secondary shaft S/Sh.
  • an orifice structure (the orifice passage 3 c ), serving as a lubricating oil ejection port, in the end of the first tubular portion 3 allows the dynamic pressure of the lubricating oil to be further increased and also allows the lubricating oil to be more forcefully discharged (ejected). Consequently, more lubricating oil can be supplied to the lubricating oil supply passage 8 of the secondary shaft S/Sh.
  • the first tubular portion 3 includes the flange 5 having the inclined side surface 5 a such that the flange 5 is disposed at the end of the first tubular portion 3 adjacent to the secondary shaft S/Sh, part of the lubricating oil splashed and scattered by the gear closest to the flange 5 , for example, the counter first-speed gear C 1 G, is appropriately collected by the side surface 5 a of the flange 5 at the end of the first tubular portion 3 and the collected lubricating oil is supplied along the bottom surface 5 b of the flange 5 to the side surface of the bearing BG 1 through the spacing SP.
  • the transmission lubrication system 100 requires no additional pipe member, which has been required in a lubrication system known in the art, no additional members for attaching such a pipe member to the housing 1 , and no additional processing of attachment, thus resulting in a reduction in cost of parts and processing.
  • the dowel member 6 Since the first tubular portion 3 (housing 1 ) is securely coupled to the second tubular portion 4 (cover 2 ) by the dowel member 6 , part of the housing 1 in the vicinity of the secondary shaft S/Sh is accordingly supported by the cover 2 , thus appropriately increasing the rigidity of the housing 1 . Additionally, since the dowel member 6 is tightly fitted in the first and second enlarged-diameter parts 3 b and 4 b , the dowel member 6 also functions as a seal for preventing the leakage of the lubricating oil.
  • the embodiment is not limited to this example.
  • the present disclosure may be applied to any transmission that includes a gear shaft whose opening at its end is remote from a lubricating oil ejection port and a bearing for the gear shaft.
  • FIG. 5A illustrates the transmission which includes five major gear shafts, i.e., a main shaft M/Sh, a secondary shaft S/Sh, a counter shaft C/Sh, an output shaft O/Sh, and an idle shaft I/Sh.
  • the secondary shaft S/Sh is disposed farthest from the level of oil.
  • splashed lubricating oil hardly reaches into the secondary shaft S/Sh or rotational sliding portions of a bearing for the secondary shaft S/Sh.
  • an intra-shaft lubricating oil ejection port is far away from one end of the secondary shaft S/Sh as illustrated in FIG. 5B , the oil could not be distributed into the shaft in a low speed mode in which a desired oil pressure could not be provided.
  • An aspect of the present application provides a lubrication system for a transmission including a gear shaft having therein a lubricating oil supply passage which extends axially and has at least one open end, a housing rotatably supporting the gear shaft, and a cover fastened to the housing by a fastener.
  • the cover has therein a lubricating oil passage.
  • the lubrication system includes a first tubular portion, a second tubular portion, and a hollow cylindrical member disposed in the first and second tubular portions.
  • the first tubular portion faces an opening of the gear shaft, protrudes from an outer surface of the housing, and has a cavity.
  • the second tubular portion is joined to the first tubular portion and protrudes from an inner surface of the cover and has a cavity.
  • the first tubular portion has a first enlarged-diameter part axially extending from a joint at which the first tubular portion is joined to the second tubular portion.
  • the second tubular portion has a second enlarged-diameter part axially extending from the joint and having a diameter identical to that of the first enlarged-diameter part.
  • the first tubular portion includes a flange at one end adjacent to the gear shaft.
  • the hollow cylindrical member is tightly fitted in the first and second enlarged-diameter parts of the first and second tubular portions joined to each other.
  • the flange and the opening of the gear shaft define spacing therebetween.
  • dowel holes (the first and second tubular portions) arranged in the outer surface of the housing and the inner surface of the cover and a dowel member (the hollow cylindrical member) are used to introduce lubricating oil supplied from the cover into the gear shaft.
  • the spacing defined between the flange disposed near one end of the dowel hole and the opening of the gear shaft is used to introduce the lubricating oil splashed by a gear (e.g., a counter first-speed gear) closest to the flange into the gear shaft and a bearing for the gear shaft.
  • the cavities, serving as the dowel holes function as a manifold through which the lubricating oil flows.
  • the dowel member is fitted in the above-described enlarged-diameter parts extending in opposite directions from the joint of the first and second tubular portions, and functions as a seal for appropriately preventing leakage of the lubricating oil.
  • the flange functions as a guide plate for collecting part of the splashed lubricating oil and guiding the collected lubricating oil to the inside of the gear shaft and the bearing.
  • the flange may be disposed adjacent to an outer circumferential surface of a gear closest to the flange and may have an inclined side surface.
  • the flange is disposed so as to readily introduce the splashed lubricating oil to the gear shaft.
  • the splashed lubricating oil can be appropriately collected by the inclined side surface of the flange.
  • the end of the first tubular portion adjacent to the gear shaft may have an orifice structure.
  • the lubricating oil ejected from an end surface of the first tubular portion can be increased in velocity, thus increasing a range reached by the lubricating oil. Consequently, the lubricating oil can reach the back of the inside of the gear shaft.
  • the lubricating oil can reach the inside of the gear shaft.
  • the transmission lubrication system requires no additional pipe member for introducing lubricating oil into the gear shaft whose opening at its end is remote from a lubricating oil ejection port and accordingly requires no attachment of such a pipe member to a transmission case, and enables appropriate lubrication of the inside of the gear shaft and the bearing during transition from a low speed mode to a high speed mode.
  • the dowel hole of the housing and the dowel hole of the cover are aligned with the gear shaft.
  • the cavities, serving as the dowel holes, are used as the manifold for the lubricating oil.
  • the first and second tubular portions (dowel holes) have the enlarged-diameter parts extending in opposite directions from the joint of the first and second tubular portions.
  • the dowel member (hollow cylindrical member) is tightly fitted in the enlarged-diameter parts each extending in a predetermined range.
  • the dynamic pressure of the lubricating oil is increased and the lubricating oil is forcefully discharged (ejected) from the end of the first tubular portion, so that the lubricating oil is supplied to the lubricating oil supply passage of the gear shaft.
  • the orifice structure, serving as a lubricating oil ejection port, in the end of the first tubular portion allows the dynamic pressure of the lubricating oil to be further increased and also allows the lubricating oil to be more forcefully discharged (ejected). Consequently, more lubricating oil can be supplied to the lubricating oil supply passage of the gear shaft.
  • the first tubular portion includes the flange at its end adjacent to the gear shaft and the flange has the inclined side surface, part of the lubricating oil splashed and scattered by the gear closest to the flange is appropriately collected by the side surface of the flange at the end of the first tubular portion.
  • the collected lubricating oil is guided by a bottom surface of the flange and is supplied to a side surface of the bearing through the spacing.
  • the transmission lubrication system according to the present application requires no additional pipe member, which has been required in a lubrication system known in the art, no additional members for attaching such a pipe member to the housing, and no additional processing for attachment, thus resulting in a reduction in cost of parts and processing.
  • the dowel member Since the first tubular portion (housing) is securely connected to the second tubular portion (cover) by the dowel member, part of the housing in the vicinity of the gear shaft is accordingly supported by the cover, thus appropriately increasing the rigidity of the housing. Additionally, since the dowel member is tightly fitted in the first enlarged-diameter part (housing) and the second enlarged-diameter part (cover), the dowel member also functions as a seal.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Details Of Gearings (AREA)
US14/730,237 2014-06-11 2015-06-04 Lubrication system for transmission Active 2035-11-30 US9683651B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014-120929 2014-06-11
JP2014120929A JP6140652B2 (ja) 2014-06-11 2014-06-11 変速機の潤滑機構

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US20150362060A1 US20150362060A1 (en) 2015-12-17
US9683651B2 true US9683651B2 (en) 2017-06-20

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US20170002918A1 (en) * 2013-12-06 2017-01-05 Technology Investments Limited A planetary gear hub assembly
US10047851B2 (en) * 2016-09-05 2018-08-14 Hyundai Motor Company Lubricating apparatus for differential unit of vehicle
WO2021167243A1 (ko) * 2020-02-21 2021-08-26 김수현 누유 차단 구조를 갖는 감속기
US11293542B2 (en) * 2016-02-18 2022-04-05 Zf Friedrichshafen Ag Sealing surface having leak-proof passage of an oil channel

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JP6639328B2 (ja) * 2016-05-25 2020-02-05 トヨタ自動車株式会社 動力伝達装置の潤滑構造
CN108223769B (zh) * 2016-12-22 2021-01-22 上海汽车集团股份有限公司 汽车用双电机动力系统、变速箱及汽车
DE102018008061A1 (de) * 2018-10-11 2020-04-16 Borgwarner Inc. Kupplungseinrichtung
CN112747108B (zh) * 2020-12-30 2022-05-24 苏州绿科智能机器人研究院有限公司 一种具有通气结构的减速器

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170002918A1 (en) * 2013-12-06 2017-01-05 Technology Investments Limited A planetary gear hub assembly
US10054212B2 (en) * 2013-12-06 2018-08-21 Technology Investments Limited Planetary gear hub assembly
US11293542B2 (en) * 2016-02-18 2022-04-05 Zf Friedrichshafen Ag Sealing surface having leak-proof passage of an oil channel
US10047851B2 (en) * 2016-09-05 2018-08-14 Hyundai Motor Company Lubricating apparatus for differential unit of vehicle
WO2021167243A1 (ko) * 2020-02-21 2021-08-26 김수현 누유 차단 구조를 갖는 감속기

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JP6140652B2 (ja) 2017-05-31
CN105276151B (zh) 2017-08-11
CN105276151A (zh) 2016-01-27
JP2016001027A (ja) 2016-01-07

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